Merge remote-tracking branch 'inventree/master' into build-fixes

# Conflicts:
#	InvenTree/InvenTree/views.py
#	InvenTree/build/views.py
#	InvenTree/locale/de/LC_MESSAGES/django.po
#	InvenTree/locale/en/LC_MESSAGES/django.po
#	InvenTree/locale/es/LC_MESSAGES/django.po
#	InvenTree/order/views.py
#	InvenTree/part/api.py
#	InvenTree/part/views.py
#	InvenTree/templates/js/bom.js

InvenTree/part/models.py

@@ -1134,6 +1134,60 @@ class Part(MPTTModel):
                 max(buy_price_range[1], bom_price_range[1])
             )
 
+    @transaction.atomic
+    def copy_bom_from(self, other, clear=True, **kwargs):
+        """
+        Copy the BOM from another part.
+
+        args:
+            other - The part to copy the BOM from
+            clear - Remove existing BOM items first (default=True)
+        """
+
+        if clear:
+            # Remove existing BOM items
+            self.bom_items.all().delete()
+
+        for bom_item in other.bom_items.all():
+            # If this part already has a BomItem pointing to the same sub-part,
+            # delete that BomItem from this part first!
+
+            try:
+                existing = BomItem.objects.get(part=self, sub_part=bom_item.sub_part)
+                existing.delete()
+            except (BomItem.DoesNotExist):
+                pass
+
+            bom_item.part = self
+            bom_item.pk = None
+
+            bom_item.save()
+
+    @transaction.atomic
+    def copy_parameters_from(self, other, **kwargs):
+        
+        clear = kwargs.get('clear', True)
+
+        if clear:
+            self.get_parameters().delete()
+
+        for parameter in other.get_parameters():
+
+            # If this part already has a parameter pointing to the same template,
+            # delete that parameter from this part first!
+
+            try:
+                existing = PartParameter.objects.get(part=self, template=parameter.template)
+                existing.delete()
+            except (PartParameter.DoesNotExist):
+                pass
+
+            parameter.part = self
+            parameter.pk = None
+
+            parameter.save()
+
+    @transaction.atomic
     def deepCopy(self, other, **kwargs):
         """ Duplicates non-field data from another part.
         Does not alter the normal fields of this part,
@@ -1153,24 +1207,12 @@ class Part(MPTTModel):
 
         # Copy the BOM data
         if kwargs.get('bom', False):
-            for item in other.bom_items.all():
-                # Point the item to THIS part.
-                # Set the pk to None so a new entry is created.
-                item.part = self
-                item.pk = None
-                item.save()
+            self.copy_bom_from(other)
 
         # Copy the parameters data
         if kwargs.get('parameters', True):
-            # Get template part parameters
-            parameters = other.get_parameters()
-            # Copy template part parameters to new variant part
-            for parameter in parameters:
-                PartParameter.create(part=self,
-                                     template=parameter.template,
-                                     data=parameter.data,
-                                     save=True)
-
+            self.copy_parameters_from(other)
+        
         # Copy the fields that aren't available in the duplicate form
         self.salable = other.salable
         self.assembly = other.assembly